Paint brush



Feb. 11, 1958 N. F. ROWLEY PAINT BRUSH Filed Aug. 6, 1956 INVENTOR. NORMA/V F ROM LE) B) 73 4 WVW A TTOR/VE) United v States Patent Q PAINT BRUSH Norman F. Rowley, Denver, Colo.

Application August 6, 1956, Serial'No. 602,239

4 Claims. (Cl. 15-160) This invention relates to paint brushes, and particularly to brushes adapted for use in painting cylindrical or arcuate objects such as pipes, conduits and the like.

The main object of the invention is to produce a brush efficient for its intended purposes, comprising an integrally formed handle and curved frame in which the bristles are mounted so that their free ends provide brushing means particularly adapted for efiiciently applying paint or other coatings to curved or arcuate surfaces.

A feature of myinvention is the mounting of the bristles whereby they extend inwardly from the concentrically curved semicircular handle at different angles to true radially extending lines. In my construction, the bristles at opposite sides of the transverse center of the frame extend in diagonal directions which intersect each other at and slightly above the axial center of the frame, providing a concentration of bristle ends where required for maximum efficiency.

Another feature of my construction is the relatively large brushing areas provided by the free ends of the bristles, partly due to the arrangement of the bristles and partly to the dimensions of the brush. Heretofore brushes have been relatively thin from side to side, regardless of their width, the thickness being one inch or less in a brush having a five inch width.

I have found that by increasing the thickness to double the average thickness for a stated width, I gain substantially more than double the efliciency of the thinner brushes. In my preferred construction, the diametric distance between inner surfaces of the frame is limited to five inches, and the thickness of the bristles between opposite sides is approximately two inches. The increased thickness and the angles at which the bristles extend from the frame contribute to the forming of relatively large and efficient work contacting areas in which the bristles terminate.

In the drawings:

Fig. 1 is an elevational side view of a paint brush embodying my invention.

Fig. 2 is an elevational end view.

Fig. 3 is a transverse vertical sectional view taken in the plane of the line 3-3 of Fig. 1.

Fig. 4 is a bottom plan view of the brush.

In the preferred embodiment of my invention shown in the drawings, the frame is semi-circular in shape, the inner surface 11 and outer surface 12 being concentric. The surfaces 13, 13, are fiat, rectangular in shape, and in the preferred embodiment are diametrically spaced apart from each other five inches. The frame is approximately /4 inch thick and 2 /4 inches wide, providing a width of at least 2 inches for mounting the bristles 14 in the frame.

The frame 10 is thickened in its central portion to provide a radially extending handle projecting from approximately one-third of the outer surface of the handle, said handle having a slightly curved surface 15 and inwardly inclined end surfaces 16.

The bristles 14 are arranged in tufts and the tufts A 2,822,561 Patented Feb. 1 l,

are mounted in rows in cylindrical holes 18. The holes 18 communicate with bores 19 ofsmaller diameter extending to the outer surfaces 12 of the frame and 16 of the handle. Wires 17 extend through the bores 19 and engage the turned inner ends of the bristles to hold them securely in the frame.

The rows of bristle tufts nearest the transverse center of the brush, indicated at 20, extend radially toward the axial center of the semi-circular frame, but the bristles of endmost tufts 21 extend at angles to true radial lines, their directions being inclined upwardly so that they intersect at points slightly above the axial center of the frame. The rows of tufts adjacent the center tufts 20 extend almost truly radially, but the bristle tufts nearer the tufts 21 are increasingly inclined upwardly toward their free ends as is apparent from Fig. 1 of the drawing, which shows the extent to which some of the tufts extend beyond a straight line extending from one surface 13 to the other. The desired inclination of the bristles is achieved by the way the holes 18 are bored in the frame. The axes of the holes 18 near the transverse center of the frame are substantially parallel to radial directions, whereas the axes of the holes 18 removed from the transverse center of the frame extend at different upwardly and inwardly inclined angles to true radial directions. The location and arrangement of the bristles in'the frame is such that the free ends of the bristles at opposite sides of the transverse center of the frame are concentrated in and form work contacting areas indicated at 22, 23 in Fig. 1, which are relatively large and self-compensating for wear due to the concentration of bristle ends near the intersection of the areas 22, 23 resulting from the described arrangement of the bristles in the frame.

In describing the invention, reference has been made to a particular example embodying the same, but I wish it to be understood that the invention is not limited to the construction shown in the drawing and that various changes may be made in the construction and general arrangement of parts without departing from the inven tion.

I claim:

1. A paint brush for painting objects having curved surfaces comprising a rigid semi-circular frame having an inner substantially concentric surface, the frame being thickened in its central portion and forming a handle integral with the frame, said handle extending radially from approximately one-third of the circumferential area of the outer surface of the frame midway between its ends, the side surfaces of the handle being in the same planes as the sides of the brush frame and said handle and frame surfaces together forming a continuous handhold for the brush, and a plurality of tufts of bristles mounted in the frame extending from the inner surface, the tufts located at and near the transverse center of the frame extending in radial directions to near the axial center of the frame and the tufts located at opposite sides of said center tufts extending in inclined directions at different angles to true radial directions intersecting near and slightly above the axial center of the frame, whereby the bristle ends are concentrated in work contacting areas.

2. A paint bruh for painting objects having curved surfaces comprising a rigid semi-circular frame having an inner concentric relatively wide surface, the frame being thickened in its central portion and forming a handle integral with the frame, said handle having a slightly curved hand contacting surface as wide as the frame and inclined end surfaces connecting said hand contacting surface to the frame, said handle extending radially from approximately one-third of the circum- 3 ferential area of the outer surface of the frame midway between its ends, the side surfaces of the handle being in the same planes as the sides of the brush frame and said handle and frame surfaces together forming a continuous handhold for the brush, a plurality of holes extending inwardly from the inner surface of the frame, bores smaller in diameter than the holes communicating with said holes and some having ends open at the outer surface of the frame and others having ends open at the outer surface of the handle, a plurality of bristle tufts mounted in said holes in the frame and extending from the inner surface, and wires extending through said bores and into said holes retaining the bristles in said holes.

3. A paint brush for painting objects having curved surfaces comprising a rigid semi-circular frame having an inner concentric surface providing substantially two inches in width for mounting of bristles, the frame being thickened in its central portion and forming a handle integral with the frame, said handle having a hand contacting surface as wide as the frame and end surfaces connecting said hand contacting surface to the frame, the handle extending radially outwardly from approximately one-third of the circumferential area of the outer surface of the frame, a plurality of holes extending inwardly from the inner surface of the frame at diiferent angles to true radial directions, bores smaller in diameter than the holes communicating with said holes, some having ends open attthe outer surface of the frame and others having ends open at the outer surface of the handle, a plurality of bristle tufts mounted in said holes, the tufts nearest the transverse center of the frame extending radially to near its axial center and the tufts at opposite sides of said center tufts extending at different angles to true radial directions intersecting slightly above the axial center of the frame, and wires extending through said bores and into said holes retaining the bristle tufts in said holes.

4. A paint brush for painting objects having curved surfaces comprising a rigid semi-circular frame having an inner substantially concentric surface, a handle extending outwardly from the frame, and a plurality of tufts of bristles mounted in the frame extending from the inner surface, the tufts located at and near the transverse center of the frame extending in radial directions to near the axial center of the frame and the tufts located at opposite sides of said center tufts extending in inclined directions at different angles to true radial directions intersecting near and slightly above the axial center of the frame, whereby the bristle ends are concentrated in work contacting areas.

References Cited in the file of this patent UNITED STATES PATENTS 636,408 Hurvitz Nov. 7, 1899 1,766,870 Becker June 24, 1930 2,251,327 Cromie Aug. 5, 1941 FOREIGN PATENTS 3,241 Great Britain Mar. 3, 1887 

